Super Cheap auto, Repco, etc sell it-been around as long as forever. Out of balance would occur more if you put a lot in a large dia tyre. It's really designed to be used after you have the puncture and then fix later. As indicated in a previous post pilots use it before the puncture and it prevents air from leaking out. For a small a/c tyre, thats what I would do now that it was mentioned. To store it I would look around for a sealable metal screw on cannister from Coles, Red Dot, etc to put it in and then into your cockpit. If it releases foam, then the cannister will collect it all.